How effective is the lie-detector test?

Question

And what is the cost involved?

Answer 1

I am blonde size 2 and I have a couple grand in the bank just waitin to spend on you
wont cost you nothin to call me a liar

Answer 2

Polygrapghs are very effective actually. The examiner knows you are nervous and therefore can "read between the lines" to know that a certain line went up because you were definitely nervous, but know by it's reaction afterwards if you did or didn't lie. They know how to read these things. Before you actually test, you are hooked up to the machine and the examiner studies the lines of your current state to see how nervous you are and if the lines are staying consistent with your nervousness. Once the first question comes, the examiner knows what pattern your lines should be in and if that changes, then it reads as a lie. Polygraph tests can take up to several hours depending on how long it takes the examiner to study your nervousness before you begin answering his questions. Now, you can certainly "out lie" the test if you know how. I've seen people do it. BTW Melanie--- Polygraphs ARE admissable in the court of law, at least where I've been. They don't have a polygraph examiner on each case or whatnot, but if a lawyer hires one to question the person he is representing, and they receive the results, the lawyer has the choice to keep quiet [if the results would hurt the outcome for the client] or present the results in the next court hearing [if the results work on behalf of the client.]

Answer 3

I think the percentage rate is very high on them being accurate. The cost where I live (SD) is $150. We had a situation in our family where a mom accused someone of stealing her diamond ring. We knew this person would not do it, but she kept telling it to everyone. Finally the accused, said he was going to pay out of his own pocket, to take a lie detector test just to shut her up. I went with and sat in the lobby. When the test was over the tester came out and said, beyond a shadow of a doubt, this man did not steal her ring. Of course, they send the test with you and the results. Low and behold, a few weeks later the accuser found her ring, she forgot where she had hid it. How sad for the person she accused. Had it been me, I don't think I could ever forgive her.
I have heard stories about different ways you can beat a lie detector test but anyone that gives them is already on top of things people do to try and beat them, so it doesn't work.

Answer 4

..the lie detector is almost 97% accurate and given the proper circumstances and environment its probably 99.999% accurate.
Thats why anyone with an ounce of brain tissue would'nt submit
to taking the test. Most people have some secret that they feel
would ruin them..IF it got out....like all the people answering this question who would like to think it doesnt work.......you're not so sure...are you....Beware,... someone may be on to You! ..and to all the truthful people..you have nothing to fear.

Answer 5

It cannot stand alone as evidence in courtrooms today. It needs to be supported by more circumstantial or other facts. The Federal Bureau of Investigation trains and maintains staff to
provide this service. It can be provided to reader at no cost to reader. First, get your face stapled in every U.S. post office.

Answer 6

Not effective enough to be used as evidence in a court of law. Not sure what the cost is in Australia. Not very commonplace here. ; )

Answer 7

lie detectors are tricky cause the measure ur reactions so if u train ur self to keep calm u can pass it

Answer 8

A Private Investigator and prices vary.

Answer 9

Lie detector dose' n do a 100% work,any thief could save himself if he stays calm.

Answer 10

It isn't and since it isn't thought to be reliable in determining truth or lie it shouldn't be meantioned in a courtroom. We have much more reliable ways to determine if someone is lying.